Remove unused dependencies

This is a proactive followup on !19 (comment 1452259055), removing unused production/runtime dependencies. Submitting this merge request is also motivated by the attitude expressed in !21 (comment 1494491533).

I tested this by 1) building the project, 2) searching for the dependency names in the project (which almost all came back empty, except for esprima which is still a transitive dependency), and 3) linking it to https://github.com/ericcornelissen/shescape and running its fuzz targets.